ALMA
Prototype Antenna Evaluation OverviewEvaluation Overview
24
Radiometric Fast Switching Performance
AZ
EL
VertexRSI
AEC
Top Left:
Radiometrically-inferred VertexRSI antenna Az pointing errors for a -Az slew
(black squares), Az encoder pointing errors (cyan triangles), and El encoder
errors (magenta open symbols).
Top Right:
Radiometrically-inferred VertexRSI El pointing errors for an Az slew (black
squares). For the top right panel, the beam offset and the slew direction
are orthogonal, so interpretation of this case is complicated (\ie, we don't
expect the encoders to agree with the radiometric data until we have stopped
slewing).